Typically, to take relief out of the neck, you tighten the trussrod. This is clockwise looking at the nut. Turn in 1/4 turn incriments and check. You can see how much that moves it and how much more or less it needs to be moved.

As for intonation, if the 12th fret note is higher than the 12th fret harmonic, the scale needs to be longer. And vice versa...